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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c59758001e7003ebc0c592372ef0d6aa5c91c3ac67149a786113349d53c6bc9' 
  AND token = 'uAv9tEqV8/qvGjCpMyLxxu2R0a3S7JeEXe1TR13t71U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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