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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e1985cb1267749a947de8d6cd7b8c21808dffa7d42773c247073667b9ee884' 
  AND token = 'sHx4kQdRcqPGj2pXW7YJCe5e/p3yrzkcYcvC4Pn0M90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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