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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329050424c379e216c1678d5964c7c5e794927f49d7cc95d1563362ed9b85ae1' 
  AND token = '7Kqud2yv3IjIloj75yECyV21ENG+TyznpvlD+VqqMpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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