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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cfb4e66622f9134af7478d110d1e16162395627b61467a5d6249a2bd43cbfc' 
  AND token = 'tBS+1jyRDMkKUM03e1bux61dBr1gfiW5wCrpwLODFVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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