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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bb2cfcf7574d02247708cc64bfea85e2e3ddfc1f5a6bea265336cdd81b3c06' 
  AND token = 'ksvQ25zJShgMWqJCOSf/9yLLS8gra15bt6COx6pcmeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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