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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9cfebd944c777251c90cdb30ecf043467161a1da53d58075108c0a58fa1301' 
  AND token = 'beauq9Yf8wwJJ01rZ2A7WVdiQAKLX7bFq+eefScsk2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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