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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dc7c72330f5cc6ffbc9d1c4e28d7249767515e4bd4c9d0f2c879ddba219d80' 
  AND token = 'Y/u1OP64pC6boG1VaF7x8MAlPto6mqfPB1r/GrAS7KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}