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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc2d1d48dd31ad2a89c5deab0700170c7c640ff9af7229e1555e4a88e646bd0' 
  AND token = 'j1WVWGkANRDoNL+2qSyp5V3zJ+644uX6uAbfIo3IY3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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