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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b20e9c8c2ec78e2fa3aae445714e9372a6808fb7d7ae3f33b0e2e6c352ef6e' 
  AND token = 'w7pnk2NoS4msGi4yR43LeYSbo3W3g85PUqMcuu1OvTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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