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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd902cfd959d51ac819ce1fbf82d5d963197e932e4d553f34a196b46417ef06c0' 
  AND token = 'i+WGA8UoHx1DQn8240ue8OX9nHAwIpMxm5fhr6gjrYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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