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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b873c3e208705419adea70597794d442ce776edf619d88e4d214070e71493c24' 
  AND token = 'MP1wa6o/fBa76YUVe2cI+g0N/CQgT4mz3o24o/e1+lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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