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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2793e2533cb62157d87336f57f9fe53fdd6de2de6f3fe765bb99df3623eb27c4' 
  AND token = 'dLOuxBsER2e5EvGozGQMUCAlc6uexjiy+1axPLUbCks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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