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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550cd8ebabb883986409c2b17be0e10b8d35eaaf75f681857c368d7ffaa1a7b5' 
  AND token = '4OWMwEMLSvyuruR8JSXv33uWaxz1TjH4QkmZsqqw9uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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