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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95eed0e1da35b1da71c60f318dacd6e9419b82058fd2b3bc99cc1cf9284358b6' 
  AND token = '3tnmeFuywtKd+QOWM5pX/YhmsQmJZHOE4H5HeeaEReQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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