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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f1d8e5460685b610e7ce279e7302a1de126fa410b71a1f92689e22d13136b7' 
  AND token = '3J9GNLisM0mAOdOobY90TnGs4M3cH0RyDHjmttaDxYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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