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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6a765d090cde01ae505df8f39be1039ab1eb6cbbe3cc711cc4718e42194996' 
  AND token = 'yusfovfCAcbQTs6vGRAulM0wzZUgS+2/v9vOIMb4cAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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