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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df065c1afb0b7a8ca4f811d7ce3725d2b3df703867673cf4cd5b332261cd44ff' 
  AND token = '3Ny0WZtUZn3HkVX8hsZx6kZ8rjk3b+dY6K3ftXfakvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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