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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9d8e4d0e568bc00d669b514c88d247959ea9f53591fd4ae840b7cd3f644b16' 
  AND token = 'dbcF4/ve7rSdmygn/1X7R4AV53zw4dhOR88oXfcJ01A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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