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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d469477202910a6cad1f524aa6118898f3b356809b630aa27d161bc6aff7ee6' 
  AND token = 'ctEtswzI5v4oNazJxkSKezF3VZciAbeYZ7TXx6orhC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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