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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e531e0b86a31154e47cfe14bb2c5e5eda42e251b89fbe2526f1d4442e68041' 
  AND token = 'Lb6jUTELg8KLo4gR5zZdaVgoMl+YIN/qoVXB/yo45bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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