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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea6a6f557298bd79f4c7a52ec0717fab5f3ed9e619d2646bd8c1f7336639486' 
  AND token = 'jQ6lOhXCcg2IfHMqnjg7P3teSFLWkttJMrQL77110fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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