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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e296a03458795d44872bf6e5545236dc6dc2ed2113e668e50b750af7468649b2' 
  AND token = 'kY6akeDWxpocYv1ibwQ/MWhPCh7UQHRr2XGC3g0u5q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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