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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6009d39c7e2a86d86a46bb62de304d642aec2fe9dacc122ade75a409bc7f5b' 
  AND token = 'iIX08iXGEyrc2Z1zR/z8lpzVTorS6y5KDOSKDn4UhGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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