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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac75dfa4c658e4ec6aa70f8fb16ac2db8132b42f78e4c7196ffa8395ffe1d2f' 
  AND token = '3DURUH1s+z75qi/Kt8AIDW1lCBx+hKwSC0v71wWB/8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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