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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963144ac596ed7b5c3b67ba16c7f5a77d644e5eeeb0db6770ed8f20c572e99f6' 
  AND token = 'yCCtVF6mozQM8I1izA8w73WJcG/B/0Jcn8OSSlQETU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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