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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acda8fafcf652a5f347b4deb43d9da4a6b97f8035fa4d08a50b861d5ce65f958' 
  AND token = 'YIzeTsAOSx142kKkuDVFs4DPA1aPLiFPR8tMYc06Pmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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