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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b235c0c015496adad72f60a92448a9b72660acfa9f9453919d3143b2071c7d58' 
  AND token = 'tMyArFn4VgD3PdIHfDGtdIVfhWmWpoFmtfY6xWS4jrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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