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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ffdff8fa25e72cf80a1ea6e7a5d9a188dd7112e2cb8917126c01b4aa5c2d5d' 
  AND token = 'jgsb64b3ggxX2Fwmxtjsr4mCUYo26puWoMzpjoynU0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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