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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a1995ab95b92d32f49e514dcf062e80fb736cdd638f9f775964b3a09f81eb3' 
  AND token = 'qbbN1LssbwI55UCAOkbvxRcqKxdyc27TApvIGCsNexA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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