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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ff73041fd1820ce6f82f13345d7cf5e295b2307f50c66da0a857a67bc88f42' 
  AND token = 'ufIP/hxf2iwDSdisEdiksCAapEF9+nEdHhmWDxwcJcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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