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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea4fa4a6c41c829e0c5dab84ff94ddf55a652fac2baa7dea5dace8632fe9e8a' 
  AND token = '2D3QRcjjxrjBcdt48+KT2tU0vn7KsCFbF4kXoaNR7wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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