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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b495935ff8c5c38a9c576c1b9fd1f83cdfef43b7fd41ea3c024fd90f2b731e6' 
  AND token = 'jIbcW5E3AFaReYJv7/vWJeUK0Art5oVspjpf6Sp2t54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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