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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1607c22b7483c91553513cd1a2a7be4e1ef623a41d5ff346324e693f251a46' 
  AND token = 'zlkimgsPNusPLkki2feEQhaZuF8XutAm1qvYXBKmK5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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