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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31260c713847bc561d1544e0f3635003713571dd6b5ca4f11e4651807a27c9e' 
  AND token = 'ouy2so2egaKTS1JSjNV0JY+JWu6RmWG59WgtObBi2cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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