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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe10e4e1acc15c3d6bf2a6a8c8b6f8074a287b6892ec187be1a759bf8bf69c6e' 
  AND token = 'Dz1D/CguDynVH6tMbXgadSOga9aqIMCKMbAe0MrDgiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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