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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e583d152c66f54dea37aee7a60ebf848588f6a13af0e0d881aa2058503ec3e' 
  AND token = 'RKzlpC3f38GNzvc/gM2oar8CE/GhIFGCQaDtSOcE0Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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