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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7dddb0b49287012b2a4a5dc8718be55226cc00d8c2110bf1b185446053d5507' 
  AND token = 'bkZCHsYbdmmTpzeegrXh5yMMSL1UuzCHsDNX7RvuXN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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