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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cb65a384eec099e287ccb9e20803b9eb101e2ac71e9c70568482da066551f5' 
  AND token = 'PPkC0DJegpe3BFFAsEZn+sX4v0s6WvaGbuelYQV3zmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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