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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1876985b4818c82132e1c1c78d74b418ae9d18b919659448286a0658cae30059' 
  AND token = 'isVhmHVoK6lroREQWU8bB4dE30XzdeCc9dczXmDQT5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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