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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed55eded62273f1a3a199a55fe92675ff858d51fba613fd6240145d8005bb49' 
  AND token = 'Qsf7ECK4YkeqYeOQrv/BeObHWwJah1U+vDAt/Haab68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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