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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd431d6a5f1038d0f0eb12a7ddeb64ae21ff18f7da1180c5dd1bc47604bbb24dc' 
  AND token = '3bb7V9X7vkzcWvNbghqnzFzxpRgBebT/H3TdSdGFbuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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