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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2792779e33637fd62530419d13c642b5e9477b7db2d31984f8bbd57593783e9' 
  AND token = 'bXPBwsTwJWNCSLUK815yQbSXzJVWlA7zwFGEc79pXCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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