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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7955769d0e716351ad72d9b029c5e93e970b9eb1d20a3ed8cb4c9dd9cb707fdc' 
  AND token = 'vm7TxDaa9v/GRMUMW0Tva7KaT2o4W9lPHucV73tHzMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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