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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffef0105493ea03222b2dd83fefeba503e3dae8084a0649254be6e592b55baae' 
  AND token = 'Xe4gHEJW9dk/6xa7nEZnsof2/fpvUXfXDMlznxJwRuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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