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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98ec98f566d60146604d2c306c0ff6a9d4d83606da2f17ac2449f5c4376a6d3' 
  AND token = 'eOIl3BeY4vzJZ5ang4UUIUbcfc3HgdZ2ueUEJmB42e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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