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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a64877ca174e8fc19ea97f762218178e4dc1daa279a0375ad1829d6568ce4b6' 
  AND token = 'iikGBhV4A1U+5ovTfkk89e0sTaLTXtXia/AP31/6+qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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