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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215f47f0d588ff5f1eb7609b55754a8e135f92198906340df805b0e4d75ca903' 
  AND token = 'KGCF/dU0U+fukk0szQ+U3+GD3Zv6FJCugvZ/83zkPt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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