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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab6f8f6bac70ac64188a77c1c089c4c8869e2fa2fb874d3f62199875215ea40' 
  AND token = 'd9DlIYWc75oaD2f77TU5ahRdzNUaKoS1vNXeAThwzv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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