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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef58d0489b400eab1ad09327dcff4e2d6b187eb473972b5b47773f332cd56d88' 
  AND token = 'Hg2oKy/h8cwnHiP0MamCFwKAipLqbQJkxQpq2i0R718=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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