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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b71bc38f23b91be598be6730314401012c9059562ebb43e6e8f087cd4729e8' 
  AND token = 'XLSGtf511pFMTTYkkZTfvYO31sxCB0IZ1mEU6x232xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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