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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddd581652e8fc6c534342e1f69b17eb4b350d380d46b692c4723f140122b4bf' 
  AND token = '6RC1F6Qf6tJZY27XYruphMApQqtpqlu+13HOuKt6AT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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