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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1267edb36fbf454975da2b5a360d5e98c3fae0134bd85105e4bbe484bcceb7e' 
  AND token = '+HZJmaNo92twL4Z/Ptr8fkByUSl4bU/BYFP900naNIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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