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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9400bca7fe749e9983e9eb221b790e13c32d2a0414fa25e8c3648ca8be7d59' 
  AND token = '1xZePACXCBv7RMydD9lj8Qe2cVtNTJdKz4sm4+VHx9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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