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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e2523e5ab5fa72daba9483b0dd8e025d00f86f02764080c6505b4d191c7acd' 
  AND token = 'hKhMTApmdRuDPkst5Jw8lO7t27jUyECl6VMMPWtub50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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