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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbdc93e02e13c3c51e6da98d710b564247881d403e23b89b926d50fc447ce327' 
  AND token = '8O8cdpx+6jTLSUQOeKMkbn/G3By5RGjVj9TrkhP/RRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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