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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b0ca7f73f749075fc43451ee0cb4f7fe2dcf9c350f96ed29102f909e156543' 
  AND token = 'x1V/GxwnGwj42b3ct43eySy72nrzANmCBWe/R1HybF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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