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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53591cdd9f5d17fd34ae36fb6e524704eeda21c6a8828afacf96f7312535bb0' 
  AND token = 'tpjuWxobE7A2ZeRDGTvdqh2S5sCKAnFoTyeO4U8B42I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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