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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578e717a1068edfd36c812bca55ab7869562d669e4fa646da10ba92b86a46784' 
  AND token = 'gQX4mKIsDty+u4OWh57NCYeFA2lDV1n20S9wwNKCNMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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