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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360dc6f87e8db1178a01ce0ac31d3afa379cfe78427582697f2aa2914e346552' 
  AND token = 'RNYvRdy9vGZ7ItUXFH4EK5AHl/909vl9yVTnpPrbXyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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