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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9844836c56d38eb51059581b4a96489c40d4cf74f5a1b5c436dc341971a07fa3' 
  AND token = '4iRQuLjIrEGWAuVfTyaG121ho8+Snq6APWNkhEynQqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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