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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5431ed72093204fb08b4e6cc530ef6fd5da636c3d929afe355bcf44328d212' 
  AND token = '3CJIHcpARvzz9hl1ftJKc50jLT/c37Nn8uXnYIyAYKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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