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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4b0cc1a99e55a123bffe57afac7150bca2b23d3f14a9e2add3c9d288ddb94d' 
  AND token = '2c/mWcDXeG9L63jAIO4/z423NhIY0saYRlshDnuSMJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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