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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df92e8d2ae1548e64fd6d9866d9881665b80d5123a1b548512b59e261676868' 
  AND token = 'dmKhd3YWeQgqne8WrWrzpWvqe3HndEC4nW6cKdcJXok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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