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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1eb24422d2302c2dc5f360c0cf430057ba0932c2c967301448e313f583cb214' 
  AND token = 'ENK9l8l/dQabdP1pmX6TUrswa2a3PakY1dg7vM/9A+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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