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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4aa7895796270776463ec2abc742b718e60b4ac7b7bbe673eb279298b7006d' 
  AND token = 'c7lPKlB9Eo5WUQJaNzwlIolN/Fe6C5xklEk1sVnCyk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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