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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a237f77fc7761771edc0ccfda2cfe17fa3fedf1676840f0957ce95de368cca69' 
  AND token = 'K2AhtY1qo96Uot7ZnR3CGQetnaY3nNb4+tBbTs7b64s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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