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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019286dac93805d23c2ba00ffd901117e2e21ce26fb9a883c9e329d4f43a236d' 
  AND token = '2T1sCWieoqpYajMhn+z33+M0tMZ4/dkqYescp9zcjt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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