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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b998f49249f2d2fcd4e084fe96ce4866ff9ba96ce60ede185c597b8e186bb328' 
  AND token = 'B+ILz1cE0969LUiAn0BJjsykU1kCj4dJqTKUlML3BsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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